In my mind, their rightful place is transcription of written speech where the speaker pauses, and either inserts an island idea, or changes course. The comma doesn't suffice, because it's bridging an initial idea with expounding on the same idea. But so many times in written text I see it abused, lazily employed, because the author used a sentence fragment for effect, or wanted to amp up the pause and drama when a comma or, hell, even a semi-colon would have served the purpose better.

The advent of the generic AI writing style has had one good effect on my own work: making me take an unflinching look at my own laziness in writing. Now I tend to clean things up while at the same time try to inject some personality in order to NOT be dismissed as AI.